To provide photographers with a broader perspective about mobiles, lenses and cameras, here are links to articles, reviews, and analyses of photographic equipment produced by DxOMark, renown websites, magazines or blogs.

Launched in February 2011, the Sigma 50-150mm f/2.8 EX DC APO OS HSM is a trans-standard zoom lens aimed at APS-C camera users. On these APS-C models, the crop factor of the sensor (1.5x on Nikon and 1.6x on Canon) makes it comparable to the 70-200mm focal length on a full frame camera, but arguably with an even more versatile length as they reach a little longer (225mm on Nikon and 240mm on Canon). Featuring a raft of specification acronyms, it promises high performance in a well-priced package, but does the reality live up to the billing?